A Guide to SQL
A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Chapter 4, Problem 1RQ
Program Plan Intro

SQL:

  • SQL means Structured Query Language.
  • It allows user to access and manipulate databases.
  • It is a language used to create database applications that necessity to query relational databases.
  • This language is used for following ways,
    • Add data to a database.
    • Modify present data in the database.
    • Remove data from the database.

Expert Solution & Answer
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Explanation of Solution

Basic form of the SQL SELECT command:

The basic form of the SQL SELECT command is given below:

Basic form: SELECT-FROM-WHERE

Explanation:

  • The SQL SELECT command is used to retrieve given values in a database.
  • From the given basic form,
    • After user type the word “SELECT”, user list the columns that they want to include in the query results.
    • Next, user type the word “FROM” followed by table name that have the data user need to query.
    • Finally, user can list conditions that apply to the data they want to retrieve after the word “WHERE”.

Example:

The example for the SQL SELECT command is given below:

SELECT * FROM Students WHERE Subject = 'Mathematics';

The above query is used to selects all the students from the subject “Mathematics” in the “Students” table.

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A Guide to SQL

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